Evaporating apparatus.



.A'. L. WEBRE.

EVAPORATING APPARATUS. APPLICATION FILED MAR. 26, 1912.

Patented Jan.7,1913.

ED sTAtrEs PATENT OFFICE-1..)

nmnnn L. wnsnn, or new omnms, LOUISIANA, assrenon r JOHN E. MURPHY,

. or new ORLEANS, LOUISIANA.

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. qm9 426. Specification of Letters Patent. I Patented J n. 7 1913 Application filed March 26, 191fi. Serial No. 686,452. a

To all whom it may concern.-

Be it known that l, ALFRED L. Wanna, a citizen of the-United States, residing at New (lrleans, in the State of Louisiana, lave invented certain new and useful Improvements in Evaporating Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements 1n evaporating apparatus, such as vacuum pans and multiple efi'ects, and it consists in the constructions, combinations and arrangements herein described and claimed.

An object of my invention is to provide an improved means for preventing the wasteful withdrawal of uncondensed steam from the steam belt of an evaporating apparatus, while insuring a continuous thorough withdrawal of the uncondensed heating gases therefrom.

A further object of my invention is to provide an improved means for insuring an economy of steam consumption m the steam belt of an evaporating apparatus, and for preventing the extent of .efi'ective heating surface from being reduced by the retention a'nd accumulation of the heating gases in the steam belt.

In the accompanying drawings forming a part of this application, and in which similar reference symbols indicate corresponding parts in the several views :--Figure 1 is a agmentary side elevation, partly broken away, showing oneembodiment of my'invention applied to the steam belt of an evaporating apparatus; Fig. 2 is a fragmentary section of the steam belt of an evaporating apparatus, with a modified form of my invention applied thereto; and Fig. 3 is a detail plan new of my improved re lating means shown in Fig. 2.

eferring to the drawings, 1 indicates the steam belt of an evaporating apparatus,

which is provided with a drain pipe 2, extending from the lower tube sheet 3 through the bottom 4 of the apparatus, for discharging the vwater of condensation condensed from the steam circulating through said steam "belt. 7

'The air and other unc'ondensed gases of the heating medium are withdrawn by a arish of Orleans and perforated pi e 5 extending within the steam belt, an communicating with a pipe 6 leading from the upper tube sheet 7 through the side 8 of the evaporating apparates.

In order to insure an edicient operation and to avoid steam waste, it is necessary that the heating gases be withdrawn through the pipe 6 at a rate which will prevent an accumulation of gases in the steam belt and also prevent the wasteful withdrawal of steam therefrom. l have shown means for determining and controlling such rate of withdrawal, which comprise a vertical ipe, or cooler, 9 "for conducting thegases om said pipe 6 to a header 10 leading to a condenser or vacuum pump; a thermometer 11 and valve 12 being inserted in the connection between said cooler and. header. small, fixed amount of Water is continuously injected into the cooler 9 in a direction opposite to the flow of gases therethrough by a valved pipe 13 provided with a nozzle 14; said in ected water escaping through a. water sealed drain pi e 15. By this improved construction, if there be a wasteful amount of steam in the withdrawn gases, the small injection of water into the cooler 9 will not be sufficient to condense all of suchsteam, hence thelatent heat liberated by the condensation of a portion of the steam will maintain the temperature of the mixture, and the thermometer 11 will inclients a temperature of the withdrawn gases substantially equal to that within the steam belt 1. When this condition occurs, the valve 12 is partially closed to decrease the rate of withdrawal of the gases, in order that the steam may be more completely condensed in the steam belt. On the other hand, if the withdrawn gases be entirely free from steam, said gases will be materially cooled'by the continuous injection of water into the cooler 9, and the thermometer 11 will indicate a substantial drop in temperature; whereupon, the valve 12 will be opened to increase the rate of withdrawal for preventing accumulation of gases in the steam belt.

Figs. 2 and 3 illustrate a modification in which a connection 16 between the cooler 9 and header 10 is provided with a diaphragm valve 17 automatically actuated by a thermostat 18; thereby providing means uniformity of operation.

for automaticall controlling the rate of withdrawal of t e heating gases from the steam belt 1. A pipe 18", 18, 18 and 18 is shown connect" the thermostat 18-to the valve 17, to provi e a protective casing for any suitable connection between said thermostat and valve.

From the above description, it will be clear-that my invention provides means for causing an'efliciently rapid circulation and withdrawal of the heating vapors in such manner as to insure an economical steam consumption and to prevent the accumulation of gases in the steam belt; thereby maintainmgla maximum heatin capacity of the entire eatlng surface an insuring a I claim In an evaporating apparatus provided with injecting a cooling fluid in said conduit at a point intermediate of said steam belt and thermal device. y

In testimony whereof, 'I aflix my signature, in presence of two witnesses.

, ALFRED L. WEBRE. Witnesses:

EDWARD HARE,

CAMILLE MASSON. 

